Polish rod hanger



June 10, 1952 c. w. SHELTON POLISH ROD HANGER 2 SHEETSSHEET 1 Filed Oct.17, 1950 INVENTOR CALVIN WILLIAM SHELTON BY adw'hfiflf ATTORNEY June 10,1952 c. w. SHELTON POLISH ROD HANGER Filed Oct. 17, 1950 2 SHEETSSHEET 2INVENTOR CALVIN WILLIAM SHELTON ATTORNEY Patented June 10, 1952 rdmsirif: v v

o iwm w. sheuon mr er, Tex.,;'assignor mg; Huber, Gurnoratiom, Locust-N. J., a-corporatiomof New Jersey,

by ruet; lirtyice -anenoweo aig topreye ingv'ipawitor theiratoi iettfirntafiiis" cure ct'to the zhairgervx sumstructurencs' arflt'iLimits." the permissible ".vertical movement i :the' hanger; relativeto?" thtapolish .f'od; .frequeiitly to such I an; extent-that thedesiredflpurpos'i is a'riot ompletely 1-aocomp1ished;=:aszwhen:Vthemotioniof therociis stopped'nearathe top .05 its Stroke; ..A1s'o*, in;slun -structure; the; arotgtmg: mechanism con-i tinpes' topperata-even-;whemthe idownwara;mo; .tion', of the'1-po1ish- .rod;1ssobstriicted-sandzthearoni is held 1 against rotation;thereby"p1acingi:.unnye-1 sired torsional stressesiomtheafioda.Earthcammoret hangers, containing i'siip .mean'sg will slide? down thepolish red when theardbwnwarrimdtiomofa the rod prevented; but;willziagain-rgriptheazbd immediately at; the" starfl of: thezoupwardmoticn of the hangeratidihence 21,1149} v positiontbeiowrthaia normally:desired; wherebyconiimuew.openationwfi the hanger-'- wiilzitzpermifidownwardlmotibnaotithe polish rod only to ithe 'pos-itioniiwhervtheeobstructiom originally occurred; even: thoughvsneh obs'tructior'rhas;beeni removemmm :wiiitraisaithei: fiolish rdd to afi-imdesir'ablyelevatedaposifionr If; is an obi'ect oi my" imFentiDfitdl pmyldezmw newand improved? p'oiisin rottihanig'ertandirotatora Another obi'ciifii'stcfi provide:w'pollsmrodihangent and rotamr wfiereifi the turntableaandhpawl are enclosed in ahcasin g whicltprotectsthem from being renderedmoperative bymust;cdintgice and snow and: which: holds ai-iodyoflzlubricant maintain: the: rotating mechanismiiubn'c'atem further dbli'ift is"- to provide mpoi'ish: and :rotator whichs'lidablyi'mxififitedfiionxthe polish rod so that it can moveaownwamreaame 1y to the I'Odxtd necSsar-y extefitwifict will fiot alfi'ei :the 1 161 l ififififiting'f' p'tiSTtiOfl of! 5th??? polish rodanother otijectzie' pivfdifi polishrod: hangar amt whim downwardrelativw to mid and which: is constructed-:thezt thwotatm g mecmnism in-"dfEsW-iflOfiifiibN fdtfitflie-Jfidi ge m sa-move tm firmer I id zifidlish rw nafigeranxrme tater lie-above -cmatrattle: w 1 1; re srmmeand c 'dfidniiralt'ifi tf'sifi ail'tl ifi wfiifi tfi wts 6 soconstructed and arranged ttrat readily removeai fmm the wish ro'd iorreisair, re lacement al-id'fihelike l bjii provide a new article ofmammetuream wm- Vance" the-. sart. Still otlier obieotsfcviilll fllnfi ahereinafter.

The above and; otherrobjectsi may homecomplished in accordancewithzmyi'infienflonu which compriseszzavpoiish' rbdfianger andi'rotator hat isadaptedzito support-a; abiisl i rodizandi :t'dx part 7 firmly securingthe rotatable plate to the ratchet turntable for rotation therewith, anda clamp firmly secured to the polish rod above the rotatable plate andnormally supported by and only frictionally engaging the upper surfaceof the rotatable plate. Preferably, the annular casing is closed so asto holda body of lubricant and to prevent the entrance of Water, dirt,ice and snow and which casing completely encloses the ratchet turntableand actuating pawl so as to protect them from dirt, water, ice and snowand maintains the ratchet turntable and the pawl continuouslylubricated.

Preferably, the casing comprises an inner cy lindrical side wall havingan internal diameter slightly larger than the diameter of the polish rodso that it may slide freely overthe polish rod, an outer substantiallycylindrical side wall spaced laterally from the inner side wall so as toprovide an annular space for the ratchet turntable, an

annular bottom wall at the lower end of the side walls completelyclosing the lowerend of the annular space between the side walls androtatably supporting the ratchet turntable so as to provide an annularreceptacle which will hold a lubricant for lubricating the ratchetturntable, and

an annular cover plate rotatably mounted over as to prevent. dirt,water, snow and ice fromen tering the casing, the cover plate beingsecured to. the ratchet turntable by means positioned between the sidewalls of the casing so that the cover plate will rotate with theturntable. Preferably, the lower surface of. the. cover plate isrecessed toreceive the upper ends of the side walls so as to morecertainly prevent the entrance of dirt, water, ice and snow into thecasing. Also preferably, the annular casing is, not secured to thehanger bar, but normally merely rests upon and only frictionallyengagesthe hanger bar so that it can be removed from the polish rodindependentl'yrof the hanger bar for cleaning, repairing or replacement.

. My invention will be more readily understood from. the detaileddescription hereinafter given, when taken with the accompanying drawingswhich illustrate preferred embodiments; of the structure of my inventionand in which Figure, 1 is a somewhat diagrammatic illustration,withparts in section, illustrating a convene tlonal assembly of oil wellpump equipment with which-my invention is adapted'to be employed; YFigure 2 is an'enlarged view showing the general relation of the hangerbar, casing, and clamp of my invention; r Figure 3 is a detailed view,partly in section, illustrating one form of polish rod hanger androtator of myinvention;

Figure 4 is a vertical sectional view taken on line 4-4 of Figure 3;

Figure5 is a horizontal cross sectional View taken'on line 5-5 of Figure3;

' Figure 6 is'a view similar to Figure 3, showing a modified form. ofconstruction of the cover plate. 7 V

7 Referring first to Figures 1 and 2, the numeral lfl indicates a Samsonpost supporting a pump jack beam [2. The beam [2 is operated by a pitmanrod 14 which is connected with the driving disc I6 of the pump unit 3..A cable is supported on the outer end of the beam I2 and is connectedwith and carries the polish rod hanger bar 22. The hanger bar, throughmechanism to be described, carries and reciprocates polish rod bar 22 isslidably mounted on the polish rod 24.

In other words, the bore in the hanger bar, through which the polish rodpasses, is slightly larger than the diameter of the polish rod so thatthe hanger bar fits loosely over the polish rod and the hanger bar canfreely slide downward relative to the polish rod whenever for any reasonthe polish rod is prevented from moving downward.

Referring more particularly to Figures 3 to 5, a substantially annularcasing, indicated generally by the numeral 32, is also slidably mountedon the polish rod above the hanger bar. Such casing 32 comprises aninner cylindrical .side wall 34, an outer substantially cylindrical sidewall 35, an annular bottom wall 38, and an annular cover plate 40. Theinner cylindrical wall 34 has an internal diameter slightly larger thanthe diameter of the polish rod so that-such wall fits suf ficientlyloosely on the polish rod and will freely slide over the polishrod. Theouter side wall 36 is provided with an outwardly projecting portion 42for supporting an actuating pawl 48. Otherwise, the wall 36 iscylindrical and coextensive vertically with the inner wall 34, and isspaced laterally from theinner wall 34 so as to provide an annular spaceto receive the ratchet turntable, the bearings therefor and a body oflubricant. The bottom wall 38 extends from the bottom of the side wall 31 to the bottom of the side wall 36 and completely closes the lower endof the space betweenthe side walls. Preferably, the walls 34, 36, and38are made integral with each other.

Preferably, the casing 32 is not fastened to the hanger bar-22, but isnormally supported by and only frictionally engages the hanger bar. Ifdesired, the lower surface of the bottom wall 38 may be roughened asshown so as to increase the friction between it and the upper surface ofthe hanger bar andto further hinder any rotation of the casing. However,it will be understood that the casing 32 may be detachably secured tothe hanger bar-by any suitable means, such as a flange or lugs at thelower portion of the casing and blots and nuts or the like. Also, ifdesired, the casing 32 may be permanently secured to the hanger bar ormade integral therewith, but such construction is generally undesired asit will prevent removal of the casing and the rotating mechanism fromthe polish rod independentlyof the hanger-bar. r

A ratchet turntable 44 is rotably mounted within the casing 32 on rollerbearings 46 of conventional design. Obviously, ball bearings, orbearingsofother conventional types, may be substituted for the rollerbearings. The ratchet turntable is operated by anactuating pawl 48pivotally mounted on the eccentric 50 on the end of a shaft 54. Asshown, the shaft 54 is rotatably mounted in ball bearings 56 in theoutwardly projecting portion 42 of theouter wall 36. The outer end ofthe shaft 54 carries a lever 58 which is connected to the beam l2 by acable 60 in the usual manner. A holding dog 62 is pivoted on pin "64mounted in the side wall 5 36 Such: holding'izdogi 62' engages theratchet teeth of the ratchet turntable in the usual manher to-' preventreverse rotation of T the ratchet tu'r'iit'alolei The outer wall:36}-is"provided. with one or more oil" holes 66 for the introduction of-oiloi' other lubricant through an oil cup'or the like. Such oil hole isgenerally positioned above the ratchet turntable soithat theibody of oilin'- the casing: will cover the ratcHet-turntable and provide a layer ofprotective lubricant o'ver'the teeth of-th'e' ratchet.

A'sshowm'a cylindricalwall or ring. 6'8 ispositi'o'ned between thesisidwalls 34 and" 36s and preferably. inwardly of the .teeth of the ratchetturntable =44; Suchcylindrical'wall'68 rests upon and is supported bythe ratchet turntable. The lower end of the wall 68' is'flrmly securedto the ratchet turntable by set-.-pins-'10.-o'r the like. The upper endofthe cylindrical wall 6'8. abuts'against and supports the'coveriplatelfl. Such -cylindrical wall 68' is firmly secured to the cover plate byscrews 12 as shown in'Figurei3., Thus-'the cover plate 40. is supportedby and firmly securedto the'ratchetturntable'44 for rotation therewith.i The cover plate ill-is-annularand extends over the 'endsof thesidewalls 34 and 36" and over the annular space between them so as toprevent dirt-rain, ice and'snow from'entering into the casing; The innerbore of the cover plate is slightly larger in diameter than the diameterof the polish rod so that it fits loosely on the: polish rod and willfreely slide thereover. The outer edge of the cover plate may'extendbeyond the sidewall 36 by any desired amount.

Adjacent its inner edge, the underside of the cover'plate 40 is providedwith an annular recess 14 to receive thevtapered upper end of the innerside wall 34. The under surface of the cover plate 40 is also providedwith-an annular recess 16 near itsouter edge to receive the 'upper endof the outer wall 36. Preferably a snap ring 18 is provided in theoutersurface of the upper end of the outer wall 36 between such wall and thevertical surfaceof therec'ess lfi inthe cover plate was to morecertainly: prevent the 'en- ,1

modate the fastening means for securing them together and-to the-polishrod, and is of substantial height to providea large surface-contact withthe polish rod. The mutually contactingsurfaces-of the clampand'ofthe-cover plate. maybe roughened to increase the friction betweenthem, or smoothed to decrease'the friction, as-desired. Also, the formof the clamp maybewidely varied, particularly to vary'the area ofthe,surface which contacts. the cover plate soas to vary "the frictionbetween them, suchas by providing an outwardly extending flange-at thelower end of the clamp.

Figure- 6 illustrates a slightly. modified .form of the structure shownin Figures 3 to-5. In

this modified form, the cylindrical wall 68 is secured to the coverplate H) by'welding, as shown at 86. Also, a single annular recess 88 isprovided in thelower' surface of the cover plate; 40 to reeeive'theupper ends of bothof the endwallsa34 ari'ctSt;-

Inanormal -operation; the polish rod 24 wilhb'e carried by the" clamp80" which i is. supported? by the hanger bar 22: through: the coverplate 40, the cylindrical wall- 68, i the turntable 44;..and the casing32. Upon operation of the. rbeker beam [2, the polish rod? will bereciprbcated-by reciprocation of the hanger bar 22 in :the :manner wellknown to the art.- At'the same time,.the actuating pawl 48' will beoperated' in theqcorrventional manner to. intermittently rotate theratchetturntableand: the cover' plate 40:, and the" cover plate willtransmit. such motion to the-clamp 80 and the polish rodthrough frictionbetween the upper surface ofthe coverplateand the bottom surface of theclamp. However; if

the: downward motion of the polish rod 24 is prevented by an obstructionin the well orthe pumpzor for other reasonythe hanger bar; and thec'asing 32-willcontinue their downward movement; sliding over the polishrod 24.; and-the cover-"plate 40: will be immediately disengaged fron'rthe clamp 80', whereby continued operation of the ratchet pawl andratchet: turntable will be inoperative to-rotatethe polish rod. When thehanger bar isthereafter moved upward,-.it will carry the casing: 32withit, but the cover plate 40 will not'engage the, clampgfifliuntilwithas: been raised to the position-at; which the downward motion of thepolishrod and the clamp had stopped. Further upward motion of thehanger; will usually lift the polishrodfrom the obstruction before-thefriction, between the cover plate and the clamp; becomes sufficient: tocause therotating'mechani-smtoexert any-f appreciable rotatingstress'onthe polisharodr If, due toyany difficulty in theoil well or-pump; therotation of the polish rod isprevented or: seriously resistedwhile it issupported by theha-nger and rotator, the continued. operationof theratchet turntable will fail to impose any damaging torsional stress onthe polish rod, because of; the frictional engagement-of-thecover plate4ll-with the clamp 80 whichwill permitrotati'onof; the plate 40independently of the clamptl] .vjhen the force,- required' to rotate thepolish rod, be-

comesexcessive; v g 7 It will be understood that the structure, shown inthe drawings and described in detail; is-'- given solely forillustrative purposes; and that; many variations "and modifications maybe madetherein-without-departing from the spiritor scope of myinvention.- Forexample, the cover plate; 40 and the turntablemaybe-secured together by other suitable means; such as; bars,--ro ds;bolts and nuts, a lattice-likeframeworlg', and the;like. Also,- theratchet turntable may be turned over with the ratchet teeth andactuating pawl beneath and the turntable placed against-the bottom ofthe cover plate" and secured thereto by welding, screws, bolts and nuts:and the like. Some other modifications have been indicated in thedetailed description. Still'oth'er .modificaa tions willbecome apparentto those skilled'in the art.

From all "of the: above, it will be apparent-that I haveprovided'asimple and sturdy polishrod hanger and rotatorwhich has many.advantages over the structures of the prior art: The ratchet turntableand pawl are protected from rust,- dirt, ice and snow 'so that' theywill remain operative over long periods of time irrespective ofw'eatherconditions and are keptwell lubricated so that their useful life isgreatly extended: At the same time-,- the rotating mechanism-isimmediately renderedvinoperative When the-desired motion-o1 the polishrod is hindered inany way. Also; the hanger and rotator are free to movedownward on the polish rod to any extent required by the position atwhich the downward motion of the polish rod is stopped and will notexert'any objectionable stressesion the polish rod. .Further, the hangerand rotator automatically restore and maintain the normal operation ofthe polish rodwhenany obstruction is removed. Furthermore, the casingand rotating mechanism are readily installed and removed for repairs,replacement or cleaning. Thus, it will be apparent that my inventionconstitutes a valuable contribution and 'advancein the art.

. I claim: v

. 1. 'A polish rod hanger and rotator; adapted to support a polish rodand to impart areciproeating motion and an intermittent rotating motionto the polish rod, which comprises a vertically reciprocating hanger barslidably mounted on the polish rod; a closed substantially annularcasing slidably mounted on the polish rod above the hanger bar andsupported by the hanger bar, which casing comprises an inner cylindricalside wall having an internal diameter slightly larger than the diameterof the polish rod, an outer substantially cylindrical side wall spacedlaterally from the inner side wall, an annular bottom wall at the lowerend of the side walls completely closing the lower end of the nnularspace between the side walls, an annular cover plate rotatably mountedover the side walls and covering the upper end of the space between theside walls; a ratchet turntable rotatably mounted within the casingbetween the side walls; means between the side walls firmly securing thecover plate to the ratchet turntable for rotation therewith; a ratchetactuating pawl mounted in the casing; pawl actuating means outside ofthe casing operatively connected to the ratchet actuating pawl; and aclamp firmly secured to the polish rod above the cover plate andnormally supported by and only frictionally engaging the upper surfaceof the cover plate.

2. A polish rod hanger and rotator, adapted to support a polish rod andto impart a reciprocating motion and an intermittent rotating motion tothe polish rod, which comprises a vertically reciprocating hanger barslidably mounted on the polish rod; a closed substantially annularcasing slidably mounted on the polish rod above the hanger bar andsupported by the hanger bar, which casing comprises an innercylindricalside wall having an internal diameter slightly larger than the diameterof the polish rod, an outer substantially, cylindrical side wall spacedlaterally from the inner side wall, an annular bottom wall extendingfrom the lower-end of one side wall to the lower end of the other sidewall and completely closing the lower end of the annular space betweenthe side walls, an annular-cover plate rotatably'mounted over the upperends of the side walls and extending over the upper end of the annularspace between the side walls, the lower surface of the cover plate beingrecessed to receive the upper ends of the side walls; a ratchetturntablerotatably mounted within the casing between the side walls; meansbetween the side walls firmly securing the cover plate to the ratchetturntable for rotation therewith; a ratchet actuating pawl mounted inthe casing; pawl actuating means outside of the casing operativelyconnected to the ratchet actuating pawl; and a clamp firmly secured tothe polish rod=above the cover plate and normally supported by'and onlyfrictionally engaging the upper sur= face of the .cover plate.

3. A polish rod hanger and rotator, adapted to support a polish rod andto impart a reciprocating motion and an intermittent rotating motion tothe polish rod, which comprises a vertically reciprocatinghanger barslidably mounted on the polish rod; a closed substantially annularcasing slidably mounted on the polish rod above the hanger bar andsupported by the hanger bar, which casing comprises an inner cylindricalside wall having an internal, diameter slightly larger than the diameterof the polish rod, an outer substantially cylindrical side wall spacedlaterally from the inner side wall, an annular bottom wall extendingfrom the lower end of one side wall to the lower .end of the other. sidewall and completely closing the lower end of the annular space betweenthe side walls, an annular cover plate rotatably mounted over the upperends of the side walls and extending over the upper end of the annularspace between the side walls; a ratchetturntable rotatably mountedwithin the casing between the side walls; a cylindrical supporting wallextending from the ratchet turntable to the cover plate between the sidewalls of the casing and firmly secured to both the turntable and thecover plate; a ratchet actuating pawl mounted in the casing; pawlactuating means outside of the casing operatively connected to theratchet actuating pawl; and a clamp firmly secured to the polish rodabove the cover plate and normally supported by and only frictionallyengaging the upper surface of the cover plate;

4. A polish rod hanger and'rotator, adapted to support a polish rod andto impart a reciprocating motion and an intermittent rotating mo+ tionto the polish rod which comprises a vertically reciprocating hanger barslidably mounted on the polish rod; a closed substantially annularcasing slidably mounted on the polish rod above the hanger bar andsupported by the hanger bar, which casing comprises an inner cylindricalside wall having aninternal diameter slightly larger than the diameterof the polish rod, an outer substantially cylindrical side wall spacedlaterally from the inner side wall, an annular bottom wall extendingfrom the lower end of one side wall to the lower end of the other sidewall and completely closing the lower end of the annular space betweenthe side walls, an annular cover plate rotatably mounted over the upperends of the sidewalls and extending over the upper end of the annularspace between the side walls, the lower surface of the cover plate beingrecessed to receive the upper ends of the side walls; a ratchetturntable rotatably mount ed within the casing between the side walls; acylindrical supporting wall extending from the ratchet turntable to thecover plate between the side walls of the casing and firmly secured toboth the turntable and the cover plate; a ratchet actuating pawl mountedin the casing; pawl actuating means outside of the casing operativelyconnected to the ratchet actuating pawl; and a clamp firmly secured tothe polish rod above the cover plate and normally supported by and onlyfrictionally engaging the upper surface of the cover plate.

5. A polish rod hanger and rotator, adapted to support a polish rod andto impart a reciprocatmg motion and an intermittent rotating motion tothe polish rod, which comprises a vertically reciprocating hanger barslidably mounted on the zpollsh rod; -ra wlosed 'substantially annularthedow er end of the annular space betweenthe side -walls, an' annularcover .plate rotatably mounted over'the side wallsvand coveringtheuppercend or 'the =spacebetween the side walls; a ratchet turntablerotatably mounted within the casing between the side walls; meansbetween the side walls firmly securing the, cover plate to the ratchetturntable for rotation therewith; a ratchet actuating pawl mounted inthe casing; pawl actuating means outside of the casing operativelyconnected to the ratchet actuating pawl; and a clamp firmly secured tothe polish rod above the cover plate and normally supported by and onlyfrictionally engaging the upper surface of the cover plate.

6. A polish rod hanger and rctator, adapted to support a polish rod andto impart a reciprocating motion and an intermittent rotating motion tothe polish rod, which comprises a vertically reciprocating hanger barslidably mounted on the polish rod; a closed substantially annularcasing slidably mounted on the polish rod above the hanger bar andnormally supported by and only frictionally engaging the hanger bar,which casing comprises an inner cylindrical side wall having an internaldiameter slightly larger than the diameter of the polish rod, an outersubstantially cylindrical sidewall spaced laterally from the inner sidewall, an annular bottom wall extending from the lower end of one sidewall to a the lower end of the other side wall and completely closingthe lower end of the annular space between the side walls, an annularcover plate rotatably mounted over the upper ends of the side walls andextending over the upper end of the annular space between the sidewalls, the lower surface of the cover plate being recessed to receivethe upper ends of the side walls; a ratchet turntable rotatably mountedwithin the casing between the side walls; means between the side wallsfirmly securing the cover plate to tho ratchet turntable for rotationtherewith; a

ratchet actuating pawl mounted in the casing; pawl actuating meansoutside of the casing operatively connected to the ratchet actuatingpawl; and a clamp firmly secured to the polish rod above the cover plateand normally supported by and only frictionally engaging the uppersurface of the cover plate.

'7. A polish rod hanger and rotator, adapted to support a polish rod andto impart a reciproeating motion and an intermittent rotating motion tothe polish rod, whichcomprises a vertically reciprocating hanger barslidably mounted on the polish rod; a closed substantially annularcasing slidably mounted on the polish rod above the hanger bar andnormally supported by and only frictionally engaging the hanger bar,which casing comprises an inner cylindrical side wall having an internaldiameter slightly larger than the diameter of the polish rod, an outersubstantially cylindrical side wall spaced laterally from the inner sidewall, an annular bottom wall extending from the lower end of one sidewall to the lower end of the other side wall and completely closing thelower end of the 'anular 'space betweentheside walls, an :annular cover"plate rotatably mounted over -the upper ends pf "the side walls andextending over {the upper-end of the annular space between the sidewalls, the-lower surface of the cover platebeing recessed" to receivethe upper ends of the side walls; 'a ratchet turntable rotatably'mounted within the casing between the side walls;acylinclricalsupporting wall extending from theratch et turntable to thecover plate :between the -side walls-of the casing and firmly secured toboththe turntable and the cover plate; a ratchet -,a'ctu,ating.zpawbnlounted in the easing; pawl -actuating means outside: of thecasing operatively connected to the ratchet actuating pawl; and a clampfirmly secured to the polish rod above the cover plate and normallysupported by and only frictionally engaging the upper surface of thecover plate.

8. A polish rod rotator which comprises a closed substantially annularcasing adapted to be slidably mounted on a polish rod above a hangerbar, which'casing comprises-an inner cylindrical side wall having aninternal diameter slightly larger than the diameter of the polish rod,an outer substantially cylindrical side wall spaced laterally from theinner side wall, an annular bottom wall at the lower end of the sidewalls completely closing the lower end of the annular space between theside walls, an annular cover plate rotatably mounted over the upper endsOf the side walls and covering the upper end of the space between theside walls; a ratchet turntable rotatably mounted within the casingbetween the side walls; means between the side walls firmly securing thecover plate to the ratchet turntable for rotation therewith; and aratchet actuating pawl mounted in the casing; and pawl actuating meansoutside of the casing operatively connected to the ratchet actuatingpawl.

9. A polish rod rotator which comprises a closed substantially annularcasing adapted to be slidably mounted on a polish rod above a hangerbar, which casing comprises an inner cylindrical side wall having aninternal diameter slightly larger than the diameter of the polish rod,an outer substantially cylindrical side wall spaced laterally from theinner side wall, an annular bottom wall at the lower ends of the sidewalls and completely closing the lower end of the annular space betweenthe side walls, an annular cover plate rotatably mounted over the upperends of the side walls and extending over the upper end of the annularspace between the side walls, the lower surface of the cover plate beingrecessed to receive the upper ends of the side walls; a ratchetturntable rotatably mount ed within the casing between the side walls;means between the side walls firmly securing the cover plate to theratchet turntable for rotation therewith; and a ratchet actuating pawlmounted in the casing; and pawl actuating means outside of the casingoperatively connected to the ratchet actuating pawl.

10. A polish rod rotator which comprises a closed substantially annularcasing adapted to be slidably mounted on a polish rod above a hangerbar, which casing comprises an inner cylindrical side wall having aninternal diameter slightly larger than the diameter of the polish rod,an outer substantially cylindrical side wall spaced laterally from theinner side wall, an annular bottom wall at the lower ends of the side 11 walls and completely closing the lower end of the'a'nnular spacebetween the side walls, an annular cover plate rotatably mounted overthe upper ends of the side walls and extending over the upper end of theannular space between the side walls, the lower surface of the coverplate being recessed to receive the upper ends of the side walls; aratchet turntable rotably mounted withing the casing between the sidewalls; a cylindrical supporting wall extending from the ratchetturntable to the cover plate between the side walls of the casing andfirmly secured to both the turntable and the cover plate; and a ratchetactuating pawl mounted in the casing;

and pawl actuating means outside of the casing 15 12 operativelyconnected to the ratchet "actuating pawl.

CALVIN W. SHELTON.-

REFERENCES CITED I The following references are of record in the file ofthis patent:

UNITED STATES PATEnTs 10 Number Name Date 1,681,789 Sargent Aug.21, 19282,180,880 Poulsen Nov. 21, 1939 2,280,408 Johnston. Apr. 21, 19422,444,842 McConahey et a1. July 6, 1948

